Wednesday, March 11, 2026

California Firm Ships First Batch of “World’s Highest Density” Batteries

Amprius, a California-based firm, has recently delivered the first batch of what it claims are the most energy-dense lithium batteries on the market. By weight, these silicon anode cells carry 73% more energy than Tesla’s Model 3 cells, yet they take up 37% less space.
According to Enpower, Tesla’s current Model 3 cells carry roughly 260 Wh/kg and 730 Wh/l, making them a state-of-the-art comparable. However, the new Amprius cells are a significant step up in specific energy and energy density, with 450 Wh/kg and 1,150 Wh/l, respectively. And the company points out that the undisclosed number of cells it delivered to “an industry leader of a new generation of High-Altitude Pseudo Satellites” gives it the right to brag about having “the highest energy density cells available in the battery industry today.”
The outstanding performance of the highest density batteries,…

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